design of experiments

  1. L

    Design of Experiments with existing data

    Hello, I have an experiment generated by CFD (Computational Fluid Dynamics) that includes 3 input factors that are varied to obtain 1 response. I wish to use DOE (Design of Experiments) to determine how much the variation in the response can be explained by varying the 3 input factors. I realize...
  2. victorxstc

    A curious design - What is the type / name of this rare design?

    There is this split-mouth randomized clinical trial, in which one side of the mouth receives a particular treatment, and the other side receives another treatment (usually used as the control treatment); (we do this after randomization of the left/right sides of the mouth to treatments A and X...
  3. L

    Design of experiment with multiple nuisance factors including time

    this is the case, goal : perform an experiment with 4 treatments. wish to run each treatment once in the morning, between 9:00 and 12:00. and once in the afternoon, between 1:00 and 4:00. all four treatments in the morning followed by all four treatments in the afternoon. and perform the test...
  4. B

    What Statistical Designs should I use?

    Hi! We're making a Design of Experiment that involves the use of rubber band and egg shell to see of it affect compression strength of a concrete. So, we make a proportion of the cement and two control variables in interval like 1. 100:0:0 2. 50: 50 :0 3. 50: 0: 50 4. 50: 25: 25 5. 50: 75...
  5. M

    Constrained design of experiments

    Good evening! I would like to conduct a 2-level fractional factorial experimental design on 8 factors. I used the FrF2 package in R to do so. I have capacity to do roughly 30 experiments, so I selected a resolution IV 2^(8-3) with one center-point. Repeats aren't necessary for reasons related...
  6. E

    Quasi-experiments and variable manipulation

    Hello, I am new here so forgive me if I seem amateur, After doing a lot of research and discussion with other students I have continued to find conflicting information about whether the manipulation of variables is or is not required in order for it to be a quasi experimental design. Can...
  7. S

    Factorial experiment in CRD with unequal replications

    Hi guys, i am a graduate student in statistics. i want to test for the main and interaction effect of 3 treatments on a group of patients. let say i have treatments A, B and C. each with 2 levels, presence and absence. So i decided to perform a 2^3 factorial Experiment in a Completely...
  8. N

    Repeated Measures - Maximum number of variables

    I know that the general rule of thumb is that you need 10 observations or 10 cases per variable in your model. How about in a repeated measures model? Do you count the clustered data as one observation or would you count each measurement as an observation in determining the maximum number of...
  9. T

    Is this Experimental Design even possible? Help please!

    Hello all, First thank you in advance for any and all help given in response to this question. I've been searching this forum as well as other places online and I'm still confused about what methodology I should use in this experiment. DESIGN: Participants are given two questionnaires...
  10. I

    Which approach to use for designing my experiments (DoE)?

    Hi all and welcome to my first post. I am new to the field of DoE and did a lot of background reading. Now, I need to design a series of experiments: I want to fabricate a specific part on a machine and investigate the influence of about 15 factors on the mechanical strength of that part. Some...